Toyota FJ Cruiser (GSJ 10, 15 series). Instruction — part 67

1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM

ES–223

ES

DTC SUMMARY

HINT:
The reference orifice is located inside the canister pump module.

DESCRIPTION

The description can be found in the EVAP (Evaporative Emission) System (See page

ES-352

).

INSPECTION PROCEDURE

Refer to the EVAP System (See page

ES-357

).

MONITOR DESCRIPTION

5 hours* after the ignition switch is turned to OFF, the leak detection pump creates negative pressure
(vacuum) in the EVAP system. The ECM monitors for leaks and actuator malfunctions based on the EVAP
pressure.
HINT:
*: If the engine coolant temperature is not below 35

°C (95°F) 5 hours after the ignition switch is turned to

OFF, the monitor check starts 2 hours later. If it is still not below 35

°C (95°F) 7 hours after the ignition

switch is turned to OFF, the monitor check starts 2.5 hours later.

DTC

P043E

Evaporative Emission System Reference Ori-
fice Clog Up

DTC

P043F

Evaporative Emission System Reference Ori-
fice High Flow

DTCs

Monitoring Items

Malfunction Detection Conditions

Trouble Areas

Detection

Timings

Detection

Logic

P043E

Reference orifice clogged

P043E, P043F, P2401, P2402 and
P2419 present when one of following
conditions met during key-off EVAP
monitor:
•

EVAP pressure just after reference
pressure measurement greater than
-1 kPa-g (-7.5 mmHg-g)

•

Reference pressure less than -4.85
kPa-g (-36.4 mmHg-g)

•

Reference pressure greater than -
1.057 kPa-g (-7.93 mmHg-g)

•

Reference pressure not saturated

•

Reference pressure difference
between first and second 0.7 kPa-g
(5.25 mmHg-g) or more

HINT:
Typical example values

•

Canister pump module
(Reference orifice, leak
detection pump, vent
valve)

•

Connector/wire harness
(Canister pump module -
ECM)

•

EVAP system hose (pipe
from air inlet port to
canister pump module,
canister filter, fuel tank
vent hose)

•

ECM

While ignition
switch OFF

2 trip

P043F

Reference orifice high-flow

•

Canister pump module
(Reference orifice, leak
detection pump, vent
valve)

•

Connector/wire harness
(Canister pump module -
ECM)

•

EVAP system hose (pipe
from air inlet port to
canister pump module,
canister filter, fuel tank
vent hose)

•

ECM

While ignition
switch OFF

2 trip

Sequ

ence

Operations

Descriptions

Duration

-

ECM activation

Activated by soak timer, 5 hours (7 or 9.5 hours) after ignition switch turned to OFF.

-

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1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM

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* If only a small amount of fuel is in the fuel tank, it takes longer for the EVAP pressure to stabilize.

(a) P043E: Reference orifice clogged
In operation B, the leak detection pump creates negative pressure (vacuum) through the reference orifice.
The EVAP system pressure is then measured by the ECM, using the canister pressure sensor, to
determine the reference pressure. If the pressure is lower than -4.85 kPa-g (-36.4 mmHg-g), the ECM
interprets this as a clog malfunction in the reference orifice, and stops the EVAP system monitor.
The ECM then illuminates the MIL and sets the DTC (2 trip detection logic).

A

Atmospheric pressure
measurement

Vent valve turned OFF (vent) and EVAP system pressure measured by ECM in order to
register atmospheric pressure.
If pressure in EVAP system not between 70 kPa-a and 110 kPa-a (525 mmHg-a and 825
mmHg-a), ECM cancels EVAP system monitor.

10 seconds

B

First reference
pressure measurement

In order to determine reference pressure, leak detection pump creates negative pressure
(vacuum) through reference orifice and then ECM checks if leak detection pump and vent
valve operate normally.

60 seconds

C

EVAP system pressure
measurement

Vent valve turned ON (closed) to shut EVAP system.
Negative pressure (vacuum) created in EVAP system, and EVAP system pressure then
measured.
Write down measured value as will be used in leak check.
If EVAP pressure does not stabilize within 15 minutes, ECM cancels EVAP system monitor.

15 minutes*

D

Purge VSV monitor

Purge VSV opened and then EVAP system pressure measured by ECM.
Large increase indicates normality.

10 seconds

E

Second reference
pressure measurement

After second reference pressure measurement, leak check performed by comparing first and
second reference pressure.
If stabilized system pressure higher than second reference pressure, ECM determines that
EVAP system leaking.

60 seconds

F

Final check

Atmospheric pressure measured and then monitoring result recorded by ECM.

-

Sequ

ence

Operations

Descriptions

Duration

Operation A: Atmospheric Pressure Measurement

Operation C: EVAP System Pressure Measurement

Operation B, E:

Reference Pressure Measurement

Operation D: Purge VSV Monitor

Purge VSV: OFF

Canister

Fuel Tank

Vent Valve: OFF (vent)

Canister Pump Module

Canister Filter

Canister
Pressure
Sensor

Leak Detection Pump: OFF

OFF

ON

ON (closed)

Atmospheric
Pressure

Negative
Pressure

OFF

OFF (vent)

ON

Reference Orifice (0.02 Inch)

ON

ON

ON (closed)

A112612E01

1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM

ES–225

ES

(b) P043F: Reference orifice high-flow
In operation B, the leak detection pump creates negative pressure (vacuum) through the reference orifice.
The EVAP system pressure is then measured by the ECM using the canister pressure sensor to
determine the reference pressure. If the pressure is higher than -1.057 kPa-g (-7.93 mmHg-g), the ECM
interprets this as a high-flow malfunction in the reference orifice, and stops the EVAP system monitor. The
ECM then illuminates the MIL and sets the DTC (2 trip detection logic).

EVAP Pressure when Reference Orifice Clogged:

Purge VSV

Vent Valve

Leak Detection
Pump

EVAP Pressure

10 seconds

60
seconds

60
seconds

Within 15 minutes

10
seconds

Malfunction

OK

ON

ON

ON

Positive

Negative

First Reference
Pressure

Sequence

Time

A

B

C

D

E

ON: Open

OFF: Closed
ON: Closed

OFF: Vent

A106056E04

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1GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM

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MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

Required Sensors/Components

Canister pump module

Frequency of Operation

Once per driving cycle

Duration

Within 2 minutes

MIL Operation

2 driving cycles

Sequence of Operation

None

Monitor runs whenever following DTCs not present

None

EVAP key-off monitor runs when all of following conditions met

-

Atmospheric pressure

70 to 110 kPa-a (525 to 825 mmHg-a)

Battery voltage

10.5 V or more

Vehicle speed

Below 2.5 mph (4 km/h)

Ignition switch

OFF

Time after key off

5 or 7 or 9.5 hours

Canister pressure sensor malfunction (P0450, P0451, P0452 and
P0453)

Not detected

Purge VSV

Not operated by scan tool

Vent valve

Not operated by scan tool

Leak detection pump

Not operated by scan tool

Both of following conditions met before key off

Conditions 1 and 2

1. Duration that vehicle driven

5 minutes or more

2. EVAP purge operation

Performed

EVAP Pressure when Reference Orifice High-flow Malfunction:

Pruge VSV

10 seconds

60
seconds

60
seconds

Malfunction

OK

ON

ON

ON

10
seconds

Vent Valve

Leak Detection
Pump

EVAP Pressure

Positive

Negative

First Reference
Pressure

Sequence

Time

A

B

C

D

E

ON: Open

OFF: Closed
ON: Closed

OFF: Vent

Within 15 minutes

A106057E05